公开(公告)号：US11936036B2

公开(公告)日：2024-03-19

申请号：US16952189

申请日：2020-11-19

申请人： SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

发明人： Yohei Momma ,  Hiroshi Kadoma ,  Yoshihiro Komatsu ,  Shiori Saga ,  Shunpei Yamazaki

IPC分类号： H01M4/36 ,  H01M4/485 ,  H01M4/525 ,  H01M4/58 ,  H01M10/0525 ,  H01M4/02

CPC分类号： H01M4/366 ,  H01M4/485 ,  H01M4/525 ,  H01M4/582 ,  H01M10/0525 ,  H01M2004/028

摘要： A positive electrode active material in which a capacity decrease caused by charge and discharge cycles is suppressed is provided. Alternatively, a positive electrode active material having a crystal structure that is unlikely to be broken by repeated charging and discharging is provided. The positive electrode active material contains titanium, nickel, aluminum, magnesium, and fluorine, and includes a region where titanium is unevenly distributed, a region where nickel is unevenly distributed, and a region where magnesium is unevenly distributed in a projection on its surface. Aluminum is preferably unevenly distributed in a surface portion, not in the projection, of the positive electrode active material.